How to clear values in measurelt (Toolpanel>display))
Perhaps a quicker way to do this particular job is with an array?


Create your 14-sided cylinder at the origin.
Create your cube at the origin
In Edit mode move/scale the mesh of your cube to  your desired position with respect to one of the the cylinder's faces (probably down X in your example).. leaving its origin behind.
Create an empty at the origin
Assign an Array modifier to the cube with 'Object Offset' and the empty as target
Rotate the empty in Z, entering '360/14' as the angle
set the array count to 14


You can then select the empty and the cube array together, and translate them in Z to adjust the vertical position of the cubes. and if you edit the cube, all the arrayed instances of it will be edited too.

If/when you need the cubes to be independent, you can apply the modifier.